This source file includes following definitions.
- br_dev_xmit
- br_dev_init
- br_dev_uninit
- br_dev_open
- br_dev_set_multicast_list
- br_dev_change_rx_flags
- br_dev_stop
- br_get_stats64
- br_change_mtu
- br_set_mac_address
- br_getinfo
- br_fix_features
- br_poll_controller
- br_netpoll_cleanup
- __br_netpoll_enable
- br_netpoll_enable
- br_netpoll_setup
- br_netpoll_disable
- br_add_slave
- br_del_slave
- br_dev_setup
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10 #include <linux/kernel.h>
11 #include <linux/netdevice.h>
12 #include <linux/netpoll.h>
13 #include <linux/etherdevice.h>
14 #include <linux/ethtool.h>
15 #include <linux/list.h>
16 #include <linux/netfilter_bridge.h>
17
18 #include <linux/uaccess.h>
19 #include "br_private.h"
20
21 #define COMMON_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | \
22 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM)
23
24 const struct nf_br_ops __rcu *nf_br_ops __read_mostly;
25 EXPORT_SYMBOL_GPL(nf_br_ops);
26
27
28 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
29 {
30 struct net_bridge *br = netdev_priv(dev);
31 struct net_bridge_fdb_entry *dst;
32 struct net_bridge_mdb_entry *mdst;
33 struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
34 const struct nf_br_ops *nf_ops;
35 const unsigned char *dest;
36 struct ethhdr *eth;
37 u16 vid = 0;
38
39 rcu_read_lock();
40 nf_ops = rcu_dereference(nf_br_ops);
41 if (nf_ops && nf_ops->br_dev_xmit_hook(skb)) {
42 rcu_read_unlock();
43 return NETDEV_TX_OK;
44 }
45
46 u64_stats_update_begin(&brstats->syncp);
47 brstats->tx_packets++;
48 brstats->tx_bytes += skb->len;
49 u64_stats_update_end(&brstats->syncp);
50
51 br_switchdev_frame_unmark(skb);
52 BR_INPUT_SKB_CB(skb)->brdev = dev;
53 BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
54
55 skb_reset_mac_header(skb);
56 eth = eth_hdr(skb);
57 skb_pull(skb, ETH_HLEN);
58
59 if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid))
60 goto out;
61
62 if (IS_ENABLED(CONFIG_INET) &&
63 (eth->h_proto == htons(ETH_P_ARP) ||
64 eth->h_proto == htons(ETH_P_RARP)) &&
65 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
66 br_do_proxy_suppress_arp(skb, br, vid, NULL);
67 } else if (IS_ENABLED(CONFIG_IPV6) &&
68 skb->protocol == htons(ETH_P_IPV6) &&
69 br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
70 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
71 sizeof(struct nd_msg)) &&
72 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
73 struct nd_msg *msg, _msg;
74
75 msg = br_is_nd_neigh_msg(skb, &_msg);
76 if (msg)
77 br_do_suppress_nd(skb, br, vid, NULL, msg);
78 }
79
80 dest = eth_hdr(skb)->h_dest;
81 if (is_broadcast_ether_addr(dest)) {
82 br_flood(br, skb, BR_PKT_BROADCAST, false, true);
83 } else if (is_multicast_ether_addr(dest)) {
84 if (unlikely(netpoll_tx_running(dev))) {
85 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
86 goto out;
87 }
88 if (br_multicast_rcv(br, NULL, skb, vid)) {
89 kfree_skb(skb);
90 goto out;
91 }
92
93 mdst = br_mdb_get(br, skb, vid);
94 if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
95 br_multicast_querier_exists(br, eth_hdr(skb)))
96 br_multicast_flood(mdst, skb, false, true);
97 else
98 br_flood(br, skb, BR_PKT_MULTICAST, false, true);
99 } else if ((dst = br_fdb_find_rcu(br, dest, vid)) != NULL) {
100 br_forward(dst->dst, skb, false, true);
101 } else {
102 br_flood(br, skb, BR_PKT_UNICAST, false, true);
103 }
104 out:
105 rcu_read_unlock();
106 return NETDEV_TX_OK;
107 }
108
109 static int br_dev_init(struct net_device *dev)
110 {
111 struct net_bridge *br = netdev_priv(dev);
112 int err;
113
114 br->stats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
115 if (!br->stats)
116 return -ENOMEM;
117
118 err = br_fdb_hash_init(br);
119 if (err) {
120 free_percpu(br->stats);
121 return err;
122 }
123
124 err = br_mdb_hash_init(br);
125 if (err) {
126 free_percpu(br->stats);
127 br_fdb_hash_fini(br);
128 return err;
129 }
130
131 err = br_vlan_init(br);
132 if (err) {
133 free_percpu(br->stats);
134 br_mdb_hash_fini(br);
135 br_fdb_hash_fini(br);
136 return err;
137 }
138
139 err = br_multicast_init_stats(br);
140 if (err) {
141 free_percpu(br->stats);
142 br_vlan_flush(br);
143 br_mdb_hash_fini(br);
144 br_fdb_hash_fini(br);
145 }
146
147 return err;
148 }
149
150 static void br_dev_uninit(struct net_device *dev)
151 {
152 struct net_bridge *br = netdev_priv(dev);
153
154 br_multicast_dev_del(br);
155 br_multicast_uninit_stats(br);
156 br_vlan_flush(br);
157 br_mdb_hash_fini(br);
158 br_fdb_hash_fini(br);
159 free_percpu(br->stats);
160 }
161
162 static int br_dev_open(struct net_device *dev)
163 {
164 struct net_bridge *br = netdev_priv(dev);
165
166 netdev_update_features(dev);
167 netif_start_queue(dev);
168 br_stp_enable_bridge(br);
169 br_multicast_open(br);
170
171 return 0;
172 }
173
174 static void br_dev_set_multicast_list(struct net_device *dev)
175 {
176 }
177
178 static void br_dev_change_rx_flags(struct net_device *dev, int change)
179 {
180 if (change & IFF_PROMISC)
181 br_manage_promisc(netdev_priv(dev));
182 }
183
184 static int br_dev_stop(struct net_device *dev)
185 {
186 struct net_bridge *br = netdev_priv(dev);
187
188 br_stp_disable_bridge(br);
189 br_multicast_stop(br);
190
191 netif_stop_queue(dev);
192
193 return 0;
194 }
195
196 static void br_get_stats64(struct net_device *dev,
197 struct rtnl_link_stats64 *stats)
198 {
199 struct net_bridge *br = netdev_priv(dev);
200 struct pcpu_sw_netstats tmp, sum = { 0 };
201 unsigned int cpu;
202
203 for_each_possible_cpu(cpu) {
204 unsigned int start;
205 const struct pcpu_sw_netstats *bstats
206 = per_cpu_ptr(br->stats, cpu);
207 do {
208 start = u64_stats_fetch_begin_irq(&bstats->syncp);
209 memcpy(&tmp, bstats, sizeof(tmp));
210 } while (u64_stats_fetch_retry_irq(&bstats->syncp, start));
211 sum.tx_bytes += tmp.tx_bytes;
212 sum.tx_packets += tmp.tx_packets;
213 sum.rx_bytes += tmp.rx_bytes;
214 sum.rx_packets += tmp.rx_packets;
215 }
216
217 stats->tx_bytes = sum.tx_bytes;
218 stats->tx_packets = sum.tx_packets;
219 stats->rx_bytes = sum.rx_bytes;
220 stats->rx_packets = sum.rx_packets;
221 }
222
223 static int br_change_mtu(struct net_device *dev, int new_mtu)
224 {
225 struct net_bridge *br = netdev_priv(dev);
226
227 dev->mtu = new_mtu;
228
229
230 br_opt_toggle(br, BROPT_MTU_SET_BY_USER, true);
231 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
232
233 dst_metric_set(&br->fake_rtable.dst, RTAX_MTU, new_mtu);
234 #endif
235
236 return 0;
237 }
238
239
240 static int br_set_mac_address(struct net_device *dev, void *p)
241 {
242 struct net_bridge *br = netdev_priv(dev);
243 struct sockaddr *addr = p;
244
245 if (!is_valid_ether_addr(addr->sa_data))
246 return -EADDRNOTAVAIL;
247
248
249
250
251 if (dev->reg_state != NETREG_REGISTERED)
252 return -EBUSY;
253
254 spin_lock_bh(&br->lock);
255 if (!ether_addr_equal(dev->dev_addr, addr->sa_data)) {
256
257 br_stp_change_bridge_id(br, addr->sa_data);
258 }
259 spin_unlock_bh(&br->lock);
260
261 return 0;
262 }
263
264 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
265 {
266 strlcpy(info->driver, "bridge", sizeof(info->driver));
267 strlcpy(info->version, BR_VERSION, sizeof(info->version));
268 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
269 strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
270 }
271
272 static netdev_features_t br_fix_features(struct net_device *dev,
273 netdev_features_t features)
274 {
275 struct net_bridge *br = netdev_priv(dev);
276
277 return br_features_recompute(br, features);
278 }
279
280 #ifdef CONFIG_NET_POLL_CONTROLLER
281 static void br_poll_controller(struct net_device *br_dev)
282 {
283 }
284
285 static void br_netpoll_cleanup(struct net_device *dev)
286 {
287 struct net_bridge *br = netdev_priv(dev);
288 struct net_bridge_port *p;
289
290 list_for_each_entry(p, &br->port_list, list)
291 br_netpoll_disable(p);
292 }
293
294 static int __br_netpoll_enable(struct net_bridge_port *p)
295 {
296 struct netpoll *np;
297 int err;
298
299 np = kzalloc(sizeof(*p->np), GFP_KERNEL);
300 if (!np)
301 return -ENOMEM;
302
303 err = __netpoll_setup(np, p->dev);
304 if (err) {
305 kfree(np);
306 return err;
307 }
308
309 p->np = np;
310 return err;
311 }
312
313 int br_netpoll_enable(struct net_bridge_port *p)
314 {
315 if (!p->br->dev->npinfo)
316 return 0;
317
318 return __br_netpoll_enable(p);
319 }
320
321 static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
322 {
323 struct net_bridge *br = netdev_priv(dev);
324 struct net_bridge_port *p;
325 int err = 0;
326
327 list_for_each_entry(p, &br->port_list, list) {
328 if (!p->dev)
329 continue;
330 err = __br_netpoll_enable(p);
331 if (err)
332 goto fail;
333 }
334
335 out:
336 return err;
337
338 fail:
339 br_netpoll_cleanup(dev);
340 goto out;
341 }
342
343 void br_netpoll_disable(struct net_bridge_port *p)
344 {
345 struct netpoll *np = p->np;
346
347 if (!np)
348 return;
349
350 p->np = NULL;
351
352 __netpoll_free(np);
353 }
354
355 #endif
356
357 static int br_add_slave(struct net_device *dev, struct net_device *slave_dev,
358 struct netlink_ext_ack *extack)
359
360 {
361 struct net_bridge *br = netdev_priv(dev);
362
363 return br_add_if(br, slave_dev, extack);
364 }
365
366 static int br_del_slave(struct net_device *dev, struct net_device *slave_dev)
367 {
368 struct net_bridge *br = netdev_priv(dev);
369
370 return br_del_if(br, slave_dev);
371 }
372
373 static const struct ethtool_ops br_ethtool_ops = {
374 .get_drvinfo = br_getinfo,
375 .get_link = ethtool_op_get_link,
376 };
377
378 static const struct net_device_ops br_netdev_ops = {
379 .ndo_open = br_dev_open,
380 .ndo_stop = br_dev_stop,
381 .ndo_init = br_dev_init,
382 .ndo_uninit = br_dev_uninit,
383 .ndo_start_xmit = br_dev_xmit,
384 .ndo_get_stats64 = br_get_stats64,
385 .ndo_set_mac_address = br_set_mac_address,
386 .ndo_set_rx_mode = br_dev_set_multicast_list,
387 .ndo_change_rx_flags = br_dev_change_rx_flags,
388 .ndo_change_mtu = br_change_mtu,
389 .ndo_do_ioctl = br_dev_ioctl,
390 #ifdef CONFIG_NET_POLL_CONTROLLER
391 .ndo_netpoll_setup = br_netpoll_setup,
392 .ndo_netpoll_cleanup = br_netpoll_cleanup,
393 .ndo_poll_controller = br_poll_controller,
394 #endif
395 .ndo_add_slave = br_add_slave,
396 .ndo_del_slave = br_del_slave,
397 .ndo_fix_features = br_fix_features,
398 .ndo_fdb_add = br_fdb_add,
399 .ndo_fdb_del = br_fdb_delete,
400 .ndo_fdb_dump = br_fdb_dump,
401 .ndo_fdb_get = br_fdb_get,
402 .ndo_bridge_getlink = br_getlink,
403 .ndo_bridge_setlink = br_setlink,
404 .ndo_bridge_dellink = br_dellink,
405 .ndo_features_check = passthru_features_check,
406 };
407
408 static struct device_type br_type = {
409 .name = "bridge",
410 };
411
412 void br_dev_setup(struct net_device *dev)
413 {
414 struct net_bridge *br = netdev_priv(dev);
415
416 eth_hw_addr_random(dev);
417 ether_setup(dev);
418
419 dev->netdev_ops = &br_netdev_ops;
420 dev->needs_free_netdev = true;
421 dev->ethtool_ops = &br_ethtool_ops;
422 SET_NETDEV_DEVTYPE(dev, &br_type);
423 dev->priv_flags = IFF_EBRIDGE | IFF_NO_QUEUE;
424
425 dev->features = COMMON_FEATURES | NETIF_F_LLTX | NETIF_F_NETNS_LOCAL |
426 NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
427 dev->hw_features = COMMON_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
428 NETIF_F_HW_VLAN_STAG_TX;
429 dev->vlan_features = COMMON_FEATURES;
430
431 br->dev = dev;
432 spin_lock_init(&br->lock);
433 INIT_LIST_HEAD(&br->port_list);
434 INIT_HLIST_HEAD(&br->fdb_list);
435 spin_lock_init(&br->hash_lock);
436
437 br->bridge_id.prio[0] = 0x80;
438 br->bridge_id.prio[1] = 0x00;
439
440 ether_addr_copy(br->group_addr, eth_stp_addr);
441
442 br->stp_enabled = BR_NO_STP;
443 br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
444 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
445
446 br->designated_root = br->bridge_id;
447 br->bridge_max_age = br->max_age = 20 * HZ;
448 br->bridge_hello_time = br->hello_time = 2 * HZ;
449 br->bridge_forward_delay = br->forward_delay = 15 * HZ;
450 br->bridge_ageing_time = br->ageing_time = BR_DEFAULT_AGEING_TIME;
451 dev->max_mtu = ETH_MAX_MTU;
452
453 br_netfilter_rtable_init(br);
454 br_stp_timer_init(br);
455 br_multicast_init(br);
456 INIT_DELAYED_WORK(&br->gc_work, br_fdb_cleanup);
457 }